(1)(x+3)^2(x-3)^2 (2) (3m+2n-1)(3m-2n+1)
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(1)(x+3)^2(x-3)^2 (2) (3m+2n-1)(3m-2n+1)
(1)(x+3)^2(x-3)^2 (2) (3m+2n-1)(3m-2n+1)
(1)(x+3)^2(x-3)^2 (2) (3m+2n-1)(3m-2n+1)
(1)(x+3)^2(x-3)^2
=[(x+3)(x-3)]²
=(x²-9)²
=x的4次幂 - 18x²+81
.
(2) (3m+2n-1)(3m-2n+1)
=[3m+(2n-1)][3m-(2n-1)]
=9m²-(2n-1)²
=9m²-4n²+4n-1
(1)原式=[﹙x+3﹚﹙x-3﹚]²
=(x²-9)²
=x²-18x²+81
(2)原式=[3m+(2n-1)][3m-(2n-1)]
=9m²-(2n-1)²
=9m²-(4n²-4n+1)
...
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(1)原式=[﹙x+3﹚﹙x-3﹚]²
=(x²-9)²
=x²-18x²+81
(2)原式=[3m+(2n-1)][3m-(2n-1)]
=9m²-(2n-1)²
=9m²-(4n²-4n+1)
=9m²-4n²+4n-1
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